Investigators combing the Williams Township home of homicide victim Mark Werkheiser found the worker ID badge of the woman charged last month with shooting and killing her former partner and father of their four children as he slept, according to court records.

Investigators also seized ammunition, computers and other electronics from 850 Browns Drive, according to search warrant inventories.

Authorities have charged Elizabeth Collazo in the killing, saying she used her keys to sneak into Werkheiser's home and was armed with a handgun she had stolen from him. Police say she shot him six times.

Collazo, 42, of W. Nesquehoning Street in Easton was arrested 12 days after the killing when she arrived at an Easton hotel, authorities said. Northampton County District Attorney John Morganelli said he'll prosecute it as a first-degree murder case, but hasn't yet decided if he'll seek the death penalty.

Investigators have not recovered the gun used in the killing.

While authorities haven't discussed a motive, Morganelli said he believed Collazo planned the killing, which was the same day the couple were scheduled to be in court for a child custody hearing.

According to court records filed last week:

Around 7 a.m., police received a 911 call from Werkheiser's home and one of his twin 16-year-old daughters said her father was found in his bed and had been shot.

Police said they believe Werkheiser was killed around 4 a.m. as the girls slept downstairs. The girls told police they did not hear any gunshots during the night.

Inside Werkheiser's home, police said they found Collazo's identification from the Lower Nazareth Walmart where she worked. According to court records, Collazo had not lived at the Browns Drive home for the past several months.

Police also found six spent casings from a .40-caliber handgun, the weapon Werkheiser was killed with. Police also seized other ammunition, including bullets for the missing handgun.

Fingerprints were taken from two vehicles and various locations in the home; also seized from the home were various electronics including laptop computers and cellphones; hairs and fibers; and clothing and bedding.

Werkheiser had primary custody of their four children. A Northampton County judge granted Werkheiser's sister and brother-in-law custody the day of the killing,